梁柱式胶合木结构体系抗侧力性能试验

为研究梁柱式胶合木结构体系的抗侧力性能,对10榀单层单跨梁柱式木框架足尺试件进行了水平荷载试验,其中2榀为单调加载,8榀为低周反复加载,考虑了4种抗侧加强结构体系,即交叉支撑、人字撑、隅撑以及填充轻木剪力墙.根据试验现象和由试验数据获得的滞回曲线、骨架曲线、刚度退化曲线、强度退化曲线、耗能曲线等研究了各抗侧力体系的变形能力、耗能能力、破坏模式等抗震性能,结果表明,交叉支撑、人字撑结构体系表现出良好的抗侧刚度,但二者延性较差;隅撑结构体系抗侧刚度较纯框架结构体系有了一定的提高,延性好于交叉支撑、人字撑结构体系;填充轻木剪力墙结构体系表现出良好的抗侧刚度和延性.最后,分析了各抗侧力结构体系的薄弱部位,并提出了改善加强措施.

Experimental Study on Lateral Resistance of Glued laminated Timber Post and Beam Systems

In order to study the lateral resistance of glued-laminated timber post and beam structures, two monotonic tests and eight cyclic tests on full-scale one-storey, one-bay timber post and beam construction specimens were carried out, considering four lateral strengthened structure systems: frame with X-brace, frame with K-brace, frame with knee-brace and frame filled with light wood shear walls. Seismic performances were evaluated according to the experimental phenomena, hysteresis curves, envelope curves, curves of stiffness degradation, curves of strength degradation and curves of energy dissipation. Results showed that frame with X-brace system and frame with K-brace system provide much better in the elastic stiffness, but low ductility. Frame with Knee-brace system has increased in the elastic stiffness compared to pure post and beam frame system, and provides higher ductility compared to frame with X-brace system and frame with K-brace system. Meanwhile, frame filled with light wood shear walls system performs desired elastic stiffness and ductility. Finally, improvement measures were presented based on weak parts of each structure system.